Influence of Filter Cloth on the Cathode on the Electroosmotic Dewatering of Activated Sludge  

作　　者：于晓艳 张书廷 徐辉 郑磊 吕学斌 马德刚 

机构地区：[1]School of Environmental Science and Technology, Tianjin University, Tianjin 300072, China

出　　处：《Chinese Journal of Chemical Engineering》2010年第4期562-568,共7页中国化学工程学报（英文版）

基　　金：Supported by Tianjin Application Basis and Advanced Technology Studied Plans(09JCYBJC08200)

摘　　要：The mechanical dewatering of activated sludge is troublesome due to its high compressibility of solids. The dewatering can be enhanced dramatically by the use of electroosmosis,in which an electric field is applied to the sludge cake.In this study,the influence of filter cloth on the cathode on the dewatering of activated sludge was investigated.It was found that thicker filter cloth led to lower water removal from the sludge cake,so a stainless steel cathode net with small pore size instead of filter cloth was applied,which improves the dewatering efficiency and reduces the electric power consumption.Moreover,water absorbent materials were helpful to remove the water from the sludge cake.For the electroosmotic dewatering at 7 kPa and 24 V·cm-1,the water content in the sludge cake decreased to 60%(by mass) with the average 0.075 kW·h·kg-1of water removed by using the cathode net.The mechanical dewatering of activated sludge is troublesome due to its high compressibility of solids. The dewatering can be enhanced dramatically by the use of electroosmosis,in which an electric field is applied to the sludge cake.In this study,the influence of filter cloth on the cathode on the dewatering of activated sludge was investigated.It was found that thicker filter cloth led to lower water removal from the sludge cake,so a stainless steel cathode net with small pore size instead of filter cloth was applied,which improves the dewatering efficiency and reduces the electric power consumption.Moreover,water absorbent materials were helpful to remove the water from the sludge cake.For the electroosmotic dewatering at 7 kPa and 24 V·cm-1,the water content in the sludge cake decreased to 60%（by mass） with the average 0.075 kW·h·kg-1of water removed by using the cathode net.

关 键 词：activated sludge eletroosmotic dewatering filter cloth CATHODE 

分 类 号：TS214.2[轻工技术与工程—粮食、油脂及植物蛋白工程] X703[轻工技术与工程—食品科学与工程]